Fix overflow in memcpy

In function ‘memcpy’,
    inlined from ‘control_msg_serialize.constprop’ at ../app/src/control_msg.c:77:5,
    inlined from ‘run_controller’ at ../app/src/controller.c:69:12:
        /usr/include/x86_64-linux-gnu/bits/string_fortified.h:34:10:
        warning: ‘__builtin___memcpy_chk’ writing 262138 bytes into a region
        of size 262130 overflows the destination [-Wstringop-overflow=]
   return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));

Refs 901d837165
PR #2859 <https://github.com/Genymobile/scrcpy/pull/2859>

Signed-off-by: Yu-Chen Lin <npes87184@gmail.com>
Signed-off-by: Romain Vimont <rom@rom1v.com>

app/src/control_msg.h

@@ -14,8 +14,8 @@
 #define CONTROL_MSG_MAX_SIZE (1 << 18) // 256k
 
 #define CONTROL_MSG_INJECT_TEXT_MAX_LENGTH 300
-// type: 1 byte; paste flag: 1 byte; length: 4 bytes
-#define CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH (CONTROL_MSG_MAX_SIZE - 6)
+// type: 1 byte; sequence: 8 bytes; paste flag: 1 byte; length: 4 bytes
+#define CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH (CONTROL_MSG_MAX_SIZE - 14)
 
 #define POINTER_ID_MOUSE UINT64_C(-1)
 #define POINTER_ID_VIRTUAL_FINGER UINT64_C(-2)